4, Plate
LVIII, and dumped the contents. They were transported in the tunnel on
flat cars, and in the street on wagons, both cars and wagons being
provided with cradles shaped to receive the bottom of the bucket.
In the tunnels the loading was done with air-operated steam shovels,
four (Model 20) Marion shovels being used at various points of the work.
In Fig. 1, Plate LIX, one of these is shown loading the bucket. The cars
were hauled by General Electric, standard, 10-ton, mine locomotives, the
current for which was taken at 220 volts from a pair of No. 00 copper
trolley wires suspended from the roof of the tunnel. The collector was a
small four-wheeled buggy riding on the wires and connected to the
locomotive by several hundred feet of cable wound on a reel for use
beyond the end of the trolley wire. Two 8-1/2-ton, Davenport, steam
locomotives were also used in 32d Street, toward the end of the work,
after the headings had been holed through and the tunnels would quickly
clear themselves of gas and smoke. The steam shovels were supplemented
by two Browning, 15-ton, locomotive cranes, which handled the spoil in
places where timbering interfered with the operation of the shovels. All
tracks were of 3-ft. gauge throughout and laid with 40-lb. rails.
Practically all the heavy drilling was done with Ingersoll drills (Model
E 52), the trimming being largely done with jap and baby drills.
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